Paintbrush



FIG. 1 is a perspective view of a paintbrush showing my new design;

FIG. 2 is a front elevational view thereof; the rear elevational view being mirror image thereof;

FIG. 3 is a left-side elevational view thereof; and,

FIG. 4 is a right-side elevational view thereof. 

The ornamental design for a paintbrush, as shown. 